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When I was going back and forth with the shop who built mine, they said aluminum heads would realistically add 25-40HP at the flywheel. And then figure in the weigh reduction. Cutting weight is like adding horsepower.Its not all about peak HP though. The cast iron 4V heads perform worse in the lower RPM range than the cast iron 2V. Stock 4V heads are a performance hit where your car would spend most of its time. Aluminum heads can get you more power across the board, plus a smidge more peak power, plus save on weight.
When I was going back and forth with the shop who built mine, they said aluminum heads would realistically add 25-40HP at the flywheel. And then figure in the weigh reduction. Cutting weight is like adding horsepower.
Its not all about peak HP though. The cast iron 4V heads perform worse in the lower RPM range than the cast iron 2V. Stock 4V heads are a performance hit where your car would spend most of its time.
Aluminum heads can get you more power across the board, plus a smidge more peak power, plus save on weight.
